/* ==========================================================================
   Universitas - Estudos Gerais — design system
   Mobile-first: estilos base valem para telas pequenas; breakpoints
   min-width vão progressivamente ligando o layout de tablet/desktop.
   ========================================================================== */

:root {
  --color-primary: #004B40;       /* verde-petróleo */
  --color-primary-dark: #00332B;
  --color-accent: #22B3A4;        /* turquesa */
  --color-gold: #F0C779;          /* dourado */
  --color-secondary: #54595F;     /* cinza escuro */
  --color-text: #2B2B2B;
  --color-text-muted: #6B6F72;
  --color-border: #E3E5E6;
  --color-bg: #FFFFFF;
  --color-bg-soft: #F6F7F5;
  --color-bg-dark: #00332B;
  --color-hero-dark: #141A18;      /* verde escuro acinzentado, quase preto */

  --font-body: "Poppins", "Segoe UI", Arial, sans-serif;
  --font-display: "Poppins", "Segoe UI", Arial, sans-serif;

  --radius-sm: 4px;
  --radius-md: 6px;
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.10);
  --shadow-card-hover: 0 12px 28px rgba(0, 0, 0, 0.18);

  --ease-snap: cubic-bezier(0.2, 0, 0.2, 1);
  --dur-fast: 140ms;
  --dur-base: 220ms;

  --container-max: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-primary-dark);
  margin: 0 0 0.5em;
  text-wrap: balance;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 16px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.01em;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-snap), box-shadow var(--dur-fast) var(--ease-snap), background var(--dur-fast) var(--ease-snap), border-color var(--dur-fast) var(--ease-snap);
  white-space: nowrap;
}
.btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: #1c9c8f; box-shadow: 0 4px 14px rgba(34,179,164,0.35); }

.btn-outline {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color: #fff; }

.btn-gold {
  background: linear-gradient(140deg, #F0C779 0%, #E5A93C 100%);
  color: var(--color-primary-dark);
}
.btn-gold:hover { filter: brightness(1.05); box-shadow: 0 4px 14px rgba(229,169,60,0.4); }

.btn-block { width: 100%; }
.btn-lg { padding: 15px 26px; font-size: 16px; }

/* ==========================================================================
   Header / Nav — mobile base: logo + hamburger na 1ª linha,
   busca full-width na 2ª, links escondidos atrás do hamburger.
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 0 0 rgba(0,0,0,0);
  transition: box-shadow var(--dur-base) var(--ease-snap);
}
.site-header.scrolled {
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}

.nav-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  order: 1;
}
.logo-link img { height: 32px; width: auto; }

.menu-toggle {
  order: 2;
  margin-left: auto;
  display: block;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--color-primary-dark);
  padding: 4px;
}

.nav-search {
  order: 3;
  flex-basis: 100%;
  display: flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  padding: 8px 16px;
  background: var(--color-bg-soft);
}
.nav-search input {
  border: none;
  background: transparent;
  outline: none;
  width: 100%;
  font-family: var(--font-body);
  font-size: 14px;
}

.nav-links {
  order: 4;
  flex-basis: 100%;
  display: none;
  font-size: 14px;
  font-weight: 500;
}
.nav-links.open {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 4px 6px;
  border-top: 1px solid var(--color-border);
  margin-top: 4px;
  animation: menuSlideDown var(--dur-base) var(--ease-snap);
}

@keyframes menuSlideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}
.nav-links.open .nav-item-dropdown { width: 100%; }

.nav-links a { color: var(--color-secondary); }
.nav-links a:hover { color: var(--color-primary); }

.lang-switch {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.lang-switch button {
  border: none;
  background: #fff;
  padding: 6px 12px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
}
.lang-switch button.active {
  background: var(--color-primary);
  color: #fff;
}

/* ---------- Categorias (mega-menu) ---------- */

.nav-item-dropdown { position: relative; }

.dropdown-trigger {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  cursor: pointer;
  padding: 8px 0;
}
.dropdown-trigger .caret {
  font-size: 10px;
  transition: transform 0.15s ease;
}
.nav-item-dropdown.open .dropdown-trigger .caret { transform: rotate(180deg); }

.dropdown-panel {
  display: none;
  position: static;
  background: transparent;
  padding: 4px 0 0 12px;
  min-width: 0;
  grid-template-columns: 1fr;
  gap: 2px;
}
.nav-item-dropdown.open .dropdown-panel { display: grid; }
.dropdown-panel a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-secondary);
}
.dropdown-panel a:hover { background: var(--color-bg-soft); color: var(--color-primary); }

/* ==========================================================================
   Hero (home) — só a imagem (na mesma largura/container das seções
   abaixo), com um botão branco (CTA) sobreposto no canto inferior
   esquerdo.
   ========================================================================== */

.hero { padding: 16px 0; }
.hero .container { position: relative; }
.hero-bg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
}
.hero-cta-wrap {
  position: absolute;
  left: 16px;
  bottom: 16px;
  z-index: 2;
}
.hero-cta-wrap .btn {
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.btn-white {
  background: #fff;
  color: var(--color-primary-dark);
}
.btn-white:hover { background: var(--color-bg-soft); }

/* ---------- Sections ---------- */

.section { padding: 40px 0; }
.section-soft { background: var(--color-bg-soft); }

.section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: 22px;
  gap: 10px;
}
.section-head h2 { margin: 0; font-size: 22px; }
.section-head p { color: var(--color-text-muted); margin: 4px 0 0; font-size: 14px; }
.section-head a.see-all {
  font-weight: 600;
  font-size: 14px;
  color: var(--color-accent);
  white-space: nowrap;
}

/* ==========================================================================
   Course cards / grid
   ========================================================================== */

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.course-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--dur-base) var(--ease-snap), box-shadow var(--dur-base) var(--ease-snap), border-color var(--dur-base) var(--ease-snap);
  display: flex;
  flex-direction: column;
}
.course-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: transparent;
}
.course-card:hover h3 { color: var(--color-accent); }
.course-card .thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-bg-soft);
}
.course-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-base) var(--ease-snap);
}
.course-card:hover .thumb img { transform: scale(1.06); }

.course-card .thumb .badge-overlay {
  position: absolute;
  top: 8px;
  left: 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: 2px;
  color: var(--color-primary-dark);
  background: var(--color-gold);
}
.course-card .thumb .badge-overlay.soon {
  color: #fff;
  background: rgba(0, 0, 0, 0.6);
}

.course-card .body { padding: 12px 14px 14px; flex: 1; display: flex; flex-direction: column; }
.course-card .area-tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 5px;
}
.course-card h3 {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
  line-height: 1.35;
  transition: color var(--dur-fast) var(--ease-snap);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.course-card .instructor {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Selo (ex.: "Em destaque") — estilo pílula, como o "Mais vendidos" da Udemy */
.course-card .badge-pill {
  display: inline-flex;
  align-self: flex-start;
  font-size: 11px;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(34, 179, 164, 0.12);
  padding: 2px 8px;
  border-radius: 3px;
  margin-bottom: 6px;
}

/* Avaliação — só é renderizada quando existirem notas reais de alunos */
.course-card .rating {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  margin-bottom: 6px;
}
.course-card .rating .star { color: var(--color-gold); font-size: 13px; line-height: 1; }
.course-card .rating .score { font-weight: 700; color: var(--color-primary-dark); }
.course-card .rating .count { color: var(--color-text-muted); }

.course-card .price-row {
  margin-top: auto;
  padding-top: 6px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-display);
}
.course-card .price-row .current {
  font-weight: 800;
  font-size: 17px;
  color: var(--color-text);
}
.course-card .price-row .original {
  font-size: 13px;
  color: var(--color-text-muted);
  text-decoration: line-through;
}
.course-card .price-row.soon {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ---------- Carrossel horizontal de cursos ---------- */

.carousel-wrap { position: relative; }

.carousel-track {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  padding-bottom: 4px;
  margin: 0 -16px;
  padding-left: 16px;
  padding-right: 16px;
}
.carousel-track::-webkit-scrollbar { display: none; }

.carousel-track .course-card {
  flex: 0 0 190px;
  scroll-snap-align: start;
}

.carousel-btn {
  display: none;
}

/* ==========================================================================
   Navegação por categorias (abas de área de estudo) — home
   No mobile fica escondida: dá lugar ao acordeão (.category-accordion).
   A partir do tablet/desktop volta a ser a navegação em abas + carrossel.
   ========================================================================== */

.category-tabs {
  display: none;
  gap: 22px;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 20px;
}
.category-tabs::-webkit-scrollbar { display: none; }

.category-tab {
  flex: 0 0 auto;
  position: relative;
  background: none;
  border: none;
  padding: 4px 1px 12px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-snap);
}
.category-tab::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  transition: background var(--dur-base) var(--ease-snap);
}
.category-tab:hover { color: var(--color-primary-dark); }
.category-tab.active {
  color: var(--color-primary-dark);
  font-weight: 700;
}
.category-tab.active::after { background: var(--color-primary-dark); }

/* Explorador de cursos das abas (desktop/tablet): carrossel horizontal
   com todos os itens da categoria. Escondido no mobile — ver .category-accordion. */
.category-explorer {
  display: none;
  transition: opacity var(--dur-base) var(--ease-snap);
}
.category-explorer.is-fading { opacity: 0; }

.category-explorer-track {
  flex-direction: column;
  overflow-x: visible;
  scroll-snap-type: none;
  margin: 0;
  padding: 0;
}
.category-explorer-track .course-card {
  flex: 1 1 auto;
}
.category-explorer-track .course-card:nth-child(n+5) { display: none; }
.category-explorer-track.show-all .course-card:nth-child(n+5) { display: flex; }

.category-empty {
  padding: 24px 4px;
  color: var(--color-text-muted);
  font-size: 14px;
}

.category-see-all:not([hidden]) {
  display: inline-flex;
  margin-top: 16px;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-accent);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

/* ---------- Acordeão de categorias (mobile) ---------- */

.category-accordion { display: block; }

.category-accordion-item {
  border-bottom: 1px solid var(--color-border);
}
.category-accordion-item:first-child {
  border-top: 1px solid var(--color-border);
}

.category-accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  background: none;
  border: none;
  padding: 14px 2px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-align: left;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-snap);
}
.category-accordion-trigger .chevron {
  flex-shrink: 0;
  font-size: 12px;
  color: var(--color-text-muted);
  transition: transform var(--dur-base) var(--ease-snap), color var(--dur-fast) var(--ease-snap);
}
.category-accordion-item.open .category-accordion-trigger {
  color: var(--color-primary-dark);
  font-weight: 700;
}
.category-accordion-item.open .category-accordion-trigger .chevron {
  color: var(--color-primary-dark);
  transform: rotate(180deg);
}

.category-accordion-panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--dur-base) var(--ease-snap);
}
.category-accordion-item.open .category-accordion-panel {
  max-height: 2400px;
}

.category-accordion-track {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 2px 2px 20px;
}
.category-accordion-track .course-card:nth-child(n+5) { display: none; }
.category-accordion-track.show-all .course-card:nth-child(n+5) { display: flex; }

.category-accordion-panel .category-empty { padding: 0 2px 20px; }
.category-accordion-panel .category-see-all:not([hidden]) { margin: 0 2px 20px; }

/* ---------- Cursos em Alta ---------- */
/* Mobile: lista vertical. Tablet/desktop: linha horizontal (3 cards). */

.trending-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ---------- Value props ---------- */

.value-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.value-item { text-align: left; }
.value-item .icon {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--color-bg-soft);
  color: var(--color-accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  margin-bottom: 14px;
}
.value-item h3 { font-size: 17px; }
.value-item p { color: var(--color-text-muted); font-size: 14px; margin: 0; }

/* ---------- CTA band ---------- */

.cta-band {
  background: var(--color-bg-soft);
  color: var(--color-text);
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}
.cta-band h2 { color: var(--color-primary-dark); font-size: 22px; }
.cta-band p { color: var(--color-text-muted); max-width: 60ch; margin: 0 auto 22px; font-size: 14px; }
.cta-band .btn { width: 100%; }

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--color-bg-dark);
  color: #B9CBC6;
  padding: 40px 0 20px;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-bottom: 32px;
}
.footer-grid h4 {
  color: #fff;
  font-family: var(--font-body);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a:hover { color: #fff; }
.footer-logo img { height: 32px; margin-bottom: 12px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12px;
  color: #8EA6A0;
  text-align: center;
}

/* ==========================================================================
   Course sales page — mobile base: hero, depois cartão de compra
   empilhado logo abaixo (sem sticky), com barra fixa de compra
   ancorada no rodapé da tela durante a rolagem.
   ========================================================================== */

/* Faixa full-bleed: elemento irmão do .container (não fica preso à largura
   de 1200px), ocupa 100% da largura da tela em qualquer dispositivo, e vem
   logo após o <header>, sem espaço entre eles — encosta direto na barra
   superior. Engloba o breadcrumb e o hero (kicker/título/subtítulo/instrutor). */
.course-hero-band {
  background: var(--color-hero-dark);
  padding-bottom: 24px;
}
.breadcrumb {
  font-size: 12px;
  color: #8FA098;
  padding: 14px 0 0;
}
.breadcrumb a { color: var(--color-accent); }

.course-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 24px 0 56px;
}
.course-hero-main {
  max-width: 640px;
  padding-top: 14px;
}
.course-hero-main .kicker {
  color: var(--color-accent);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}
.course-hero-main h1 { color: #FFFFFF; font-size: 26px; margin-bottom: 12px; }
.course-hero-main .subtitle { color: #B7C2BC; font-size: 15px; margin-bottom: 16px; }

.meta-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
  color: #B7C2BC;
  margin-bottom: 8px;
}
.meta-row .stars { color: var(--color-gold); letter-spacing: 2px; }

.instructor-line { font-size: 13px; color: #B7C2BC; }
.instructor-line strong { color: #FFFFFF; }

/* Cartão de compra: empilhado no mobile, fica "grudado" (sticky) só no desktop */
.purchase-card-wrap { position: relative; }
.purchase-card {
  background: #fff;
  color: var(--color-text);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card-hover);
  overflow: hidden;
}
.purchase-card .thumb img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.purchase-card .content { padding: 18px; }
.purchase-card .price {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary-dark);
  font-family: var(--font-display);
  margin-bottom: 4px;
}
.purchase-card .price-note {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}
.purchase-card ul.includes {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--color-secondary);
}
.purchase-card ul.includes li {
  display: flex;
  gap: 8px;
  padding: 6px 0;
  border-top: 1px solid var(--color-border);
}
.purchase-card ul.includes li:first-child { border-top: none; }

/* Barra fixa de compra (mobile) */
.mobile-buy-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 150;
  background: #fff;
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -6px 18px rgba(0,0,0,0.12);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  animation: buyBarSlideUp var(--dur-base) var(--ease-snap) 200ms both;
}

@keyframes buyBarSlideUp {
  from { opacity: 0; transform: translateY(100%); }
  to { opacity: 1; transform: translateY(0); }
}
.mobile-buy-bar .price {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--color-primary-dark);
  white-space: nowrap;
}
.mobile-buy-bar .btn { padding: 10px 18px; font-size: 14px; }

body.has-mobile-buybar { padding-bottom: 68px; }

/* Conteúdo do curso (dentro de .col-main, dentro de .course-layout) */
.col-main section { margin-bottom: 36px; }
.col-main h2 { font-size: 21px; margin-bottom: 14px; }

.box {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
}

.learn-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.learn-grid li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14px;
  list-style: none;
}
.learn-grid li::before {
  content: "✓";
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
}

.curriculum-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
}
.curriculum-item summary {
  padding: 12px 14px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-bg-soft);
}
.curriculum-item summary::-webkit-details-marker { display: none; }
.curriculum-item summary::after {
  content: "+";
  font-size: 18px;
  color: var(--color-text-muted);
  transition: transform var(--dur-base) var(--ease-snap);
}
.curriculum-item[open] summary::after { content: "+"; transform: rotate(45deg); }
.curriculum-item p {
  padding: 12px 14px;
  margin: 0;
  font-size: 14px;
  color: var(--color-text-muted);
  animation: detailsFadeIn var(--dur-base) var(--ease-snap);
}

@keyframes detailsFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.instructor-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.instructor-card .avatar {
  width: 60px; height: 60px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--color-bg-soft);
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--color-primary);
}
.instructor-card h3 { margin-bottom: 4px; font-size: 17px; }
.instructor-card .role { color: var(--color-text-muted); font-size: 13px; margin-bottom: 10px; }
.instructor-card p { font-size: 14px; color: var(--color-secondary); margin: 0 0 8px; }

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 14px 0;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  color: var(--color-text-muted);
  flex-shrink: 0;
  transition: transform var(--dur-base) var(--ease-snap);
}
.faq-item[open] summary::after { content: "+"; transform: rotate(45deg); }
.faq-item p {
  color: var(--color-text-muted);
  font-size: 14px;
  margin: 10px 0 0;
  animation: detailsFadeIn var(--dur-base) var(--ease-snap);
}

.notice-placeholder {
  font-size: 12px;
  color: var(--color-text-muted);
  background: var(--color-bg-soft);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-top: 16px;
}

/* ==========================================================================
   Breakpoints — tablet (≥641px) e desktop (≥961px).
   Só adicionam/ligam camadas; nada aqui é indispensável no mobile.
   ========================================================================== */

@media (min-width: 641px) {
  .container { padding: 0 24px; }

  .course-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .trending-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: row; justify-content: space-between; text-align: left; }

  .section-head { flex-direction: row; justify-content: space-between; align-items: flex-end; }

  .cta-band .btn { width: auto; }

  .instructor-card .avatar { width: 84px; height: 84px; font-size: 30px; }

  .course-hero h1 { font-size: 30px; }
}

@media (min-width: 961px) {
  .nav-bar { flex-wrap: nowrap; gap: 24px; padding: 14px 24px; }
  .logo-link img { height: 40px; }
  .menu-toggle { display: none; }
  .nav-search { order: 0; flex-basis: auto; flex: 1; max-width: 560px; }
  .nav-links {
    order: 0;
    flex-basis: auto;
    display: flex !important;
    flex-direction: row;
    align-items: center;
    gap: 20px;
    margin-left: auto;
    padding: 0;
    border-top: none;
  }
  .nav-links.open { position: static; box-shadow: none; }

  .dropdown-panel {
    display: grid;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card-hover);
    padding: 12px;
    min-width: 460px;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity var(--dur-base) var(--ease-snap), transform var(--dur-base) var(--ease-snap), visibility var(--dur-base);
  }
  .nav-item-dropdown.open .dropdown-panel {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .hero { padding: 24px 0; }
  .hero-cta-wrap { left: 32px; bottom: 32px; }

  .section { padding: 64px 0; }
  .section-head h2 { font-size: 30px; }

  .course-grid { grid-template-columns: repeat(4, 1fr); gap: 24px; }
  .carousel-track { margin: 0; padding-left: 0; padding-right: 0; }
  .carousel-track .course-card { flex-basis: 260px; }
  .carousel-btn {
    display: flex;
    position: absolute;
    top: 50%;
    transform: translateY(-50%) scale(0.9);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: #fff;
    box-shadow: var(--shadow-card-hover);
    align-items: center;
    justify-content: center;
    font-size: 15px;
    color: var(--color-primary-dark);
    cursor: pointer;
    z-index: 5;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-base) var(--ease-snap), transform var(--dur-fast) var(--ease-snap), color var(--dur-fast) var(--ease-snap);
  }
  .carousel-wrap:hover .carousel-btn {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(-50%) scale(1);
  }
  .carousel-btn:active { transform: translateY(-50%) scale(0.92); }
  .carousel-btn.prev { left: -20px; }
  .carousel-btn.next { right: -20px; }
  .carousel-btn:hover { color: var(--color-accent); }

  .category-tabs { display: flex; gap: 32px; margin-bottom: 28px; }
  .category-tab { font-size: 14px; padding: 4px 1px 14px; }
  .category-explorer { display: block; }
  .category-accordion { display: none; }

  .category-explorer-track {
    flex-direction: row;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
  }
  .category-explorer-track .course-card {
    flex: 0 0 260px;
    scroll-snap-align: start;
  }
  .category-explorer-track .course-card:nth-child(n+5) { display: flex; }
  .category-see-all { display: none !important; }

  .value-grid { grid-template-columns: repeat(3, 1fr); gap: 32px; }

  .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr; gap: 32px; }

  .course-layout {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 40px;
    align-items: start;
    padding: 40px 0 80px;
  }
  .course-hero-band { padding-bottom: 96px; }
  .course-hero-main { padding-top: 28px; }
  .course-hero-main h1 { font-size: 36px; }
  .course-hero-main .subtitle { font-size: 17px; }

  /* .purchase-card-wrap ocupa a 2ª coluna do grid, esticado da 1ª à última
     linha (grid-row: 1 / -1), para que o sticky acompanhe a rolagem por toda
     a altura do conteúdo ao lado (col-main), não só o topo. Sobe com margin-top
     negativo para voltar a ficar posicionado no topo, sobreposto ao fundo
     escuro da .course-hero-band (mesma posição que ocupava antes da faixa
     existir) — a faixa reserva espaço extra no padding-bottom acima para o
     card "flutuar" sobre ele. */
  .purchase-card-wrap {
    grid-column: 2;
    grid-row: 1 / -1;
    position: sticky;
    top: 96px;
    align-self: start;
    margin-top: -380px;
  }

  .mobile-buy-bar { display: none; }
  body.has-mobile-buybar { padding-bottom: 0; }

  .col-main h2 { font-size: 24px; }
  .learn-grid { grid-template-columns: 1fr 1fr; gap: 12px 24px; }
  .box { padding: 24px; }
}